Syngas Desulfurization over Metal Zeolites

Metal ox ides suppor ted on z e o l i t e s have been demonstrated as e f f e c t i v e regenerable 4 e s u l f u r i z a t i o n a g e n t s f o r h i g h tempera ture removal of hydrogen s u l f i d e from f o s s i l f u e l s . D e s u l f u r i z a t i o n occur s by s u l f i d e format ion wi th Fe or Zn on t h e s u r f a c e of t h e z e o l i t e l a t t i c e w i t h t h e hydrogen s u l f i d e of t h e f u e l gas . Regeqera t ion by a i r o x i d a t i o n of t h e suppor ted m e t a l s u l f i d e d i s p l a c e s tX2 sulfur a s s u l f u r ox ides . Both s u l f i d a t i o n and o x i d a t i o n show e i f i c i e n t k i n e t i c s w i t h i n a tempera ture range o f 500-6OOC. which i s above t h e range of phys i ca l a d s o r p t i o n and below where me ta l v a p o r i z a t i o n or suppor t i n s t a b i l i t y prove l i m i t a t i o n s . cause of demonst ra ted a b i l i t y t o reduce t h e s u l f u r c o n c e n t r a t i o n t o s e v e r a l PPM i n t h e t empera tu re range 500 t o 650 C.